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#!/usr/bin/perl -w

...
This is the second line.
Here is line 3.
The last line is line 4.

[alex@foo bar]$ perl -w test2.pl 
Try line 4:This is line 1.
Try line 4:This is the second line.
Try line 4:Here is line 3.
Try line 4:The last line is line 4.

[alex@foo bar]$ perl -w test2.pl 
Try line 1:This is line 1.
Try line 2:This is the second line.
Try line 3:Here is line 3.
Try line 4:The last line is line 4.